One hell of a vague spoiler then. By that logic, saying that the ending to inception was good is a spoiler.
Then again, I never really found Rage very fun to begin with.

It's amusing how some loud complainers have shaped the rep of this game to make it sound horrible. I for one thought it was pretty awesome.

Is it fun at least like Painkiller?

Sort of. Its a very different game compared to Painkiller.
If you like Mad Max and vehicular combat, you may like Rage.

Well that depends, how fun did you think Painkiller was? :D I mean, it is largely considered one of the best FPS games ever, so objectively, I don't think so :D

Respectfully, I haven't found that to play out in that way in my experience. In a different format like a movie, a poor ending can easily spoil the entire movie. In either case, the audience/player has invested money, and while experiencing the media, time, into the game. If the game is good, the player feels reinforcement that they made a good decision playing this game, and a person begins to trust the developer that they didn't just hand them another poor experience. The letdown of that faith in the developer occurs when that trust is violated by a poor ending. It isn't uncommon to feel betrayed by the storyteller. It's hard to say you like something created if you don't like the author.

+1 for making me really consider my opinion

I wasn't overly fond of the game anyway, so I filed it in the "it's okay" category and moved on.

I think part of the disappointment people had with this game that it was a much more linear experience than people were expecting/hoping. That and it had some major graphical glitches when it released (it may still have them), such as the way that the textures are constantly being unloaded and reloaded in the game. So if you're looking at a certain spot and you do a 360, the game will reload all of those textures that were already loaded and it can completely take you out of the experience of the game. It's extremely ugly. I had that problem on an ATI card, but not on an Nvidia card, so maybe it was just related to ATI.

Here's a perfect example of it: https://www.youtube.com/watch?v=I1k_Dv46bBw

Like I said though, for me the problem only existed on my PC with an ATI card, not the Nvidia card.

Same here. Legacy of Kain: Soul Reaver, a game that easily goes in my top 10 of most disappointing endings was a blast from start to finish.

I haven't played Rage (although it seemed very interesting), but sounds to me that people really want to start a trend that bad ending = bad game.

I consider FPSes like this game and Far Cry 1 and Doom 3, and to a lesser extent F.E.A.R. 1 "A Modder's game". Meaning this game is soley made for the modding community so they can make their own levels/worlds and their own stories of some kind.

Why else are these games so empty and just shoot enemies as if it was Doom 1 and Wofenstien days, so modders can fill it up themselves thanks to its engine.

(Note: when I say that F.E.A.R. 1 is a lesser extent, well F.E.A.R. does has an engrossing story to get into.)

It's not bad... it's just a very average shooter. It's mostly competent (except for the technical part) but not really good in anything.

Well to be fair the texture issues should be fixed now and what is showed in that video is not something that will happen on every ATI card; the game will, most likely, work fine. I do have nvidia and I have not noticed such issues. There still was some texture popup, but not nearly as bad and calling the game ugly just sounds unfair - it was beautiful. The scenery was great, design was fantastic... Just textures weren't as sharp as they could have been, but I just can not understand how does that make a game ugly.
How on earth is Rage empty!?

Yeah, you have a point there.

Never played RAGE so I misjudged because I assume people not liking it for the same reasons not liking other similar shooters like Crysis "only made for showing off the engine" some people say or in my case, just for the modders to make cool stuff with it.

I think you misunderstand what I'm trying to say. When I played the game on an Nvidia card and those texture issues were gone, the game did look great. I really liked the way it looked. But when they were present on my ATI card, it was exactly like it was in that video, and it is ugly. Extremely ugly. In fact, it's one of the saddest excuses for video game graphics I have ever seen when they can't even make a game that loads textures properly. But, if that problem is fixed like you said, then it doesn't matter. The game is great when that isn't happening. I quit playing it on the PC I had with an ATI card because it was the most game-immersion breaking experience I had ever tried to deal with. It completely ruined the experience for me until I played it on a different video card.
I actually didn't find ME3's ending to be quite as bad as everyone else found it to be. It definitely wasn't my favorite, but it wasn't bad enough to ruin what might be my favorite video game series of all time. Similarly to Rage, perhaps I didn't mind it as much because I was already expecting it. I played the game a few months after it released, so I was already expecting disappointment with the ending. Maybe since it wasn't hyped up for me, it didn't bother me too much that it wasn't as good as it could have been.